The enzyme-linked immunosorbent assay (ELISA) test, which detects antibodies and antigens that are produced in the blood in response to HIV, is approved for use when testing donations. However, it was not allowed to be used as a diagnostic tool for those living with the virus as it had a high rate of giving false positives. The window period for this test (the time between the start of a new infection and tests being able to reliably detect it) is typically 3-12 weeks.
This Is How the HIV Test Was Invented
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